Quick question, i want to display a GraphQL Playground for my application, but i'm not using Spring Boot Where do i get the HTML, CSS and JavaScript that will display a GraphQL playground for me? I'm assuming it's just HTML, CSS and JS ?

Hello! We are currently experimenting with migrating our GraphQL app based on Kotlin with graphql-java-tools, to graphql-kotlin. We ran into an issue just now. We have a query that takes

ids:List<String>?

as an argument. When creating our schema we get an error:

Exception in thread "main" com.expediagroup.graphql.exceptions.InvalidInputFieldTypeException: Argument cannot be an interface or a union, parameter #1 ids of fun <X>.query(kotlin.collections.List<kotlin.String>?, kotlin.String?, kotlin.collections.List<kotlin.String>?): kotlin.collections.List<X>

How can this be solved?

Are there any plans to use string literals for descriptions instead of comment descriptions since comment descriptions don't get picked up by Apollo Gateway by default?

I read about there being a client, is this planned to support multiplatform like how ktor does it? Because otherwise wouldn't apollo android with coroutines support be good enough for just jvm kotlin?

hello, i personally would just do a suspendable function, since our functions effectively become the data fetcher in

graphql-java

world there is really no need for the data loader, e.g.

class Employee(val name: String, private val companyId: Int) {
  suspend fun company() = myCompanyService.load(companyId)
}

there are number of ways of how to expose the

myCompanyService

in the above

What about handling partial errors? Lets say I have an Employee that has a company and loading one Company fails. I still want data for all the Employees and companies that have data, but an error in the case where it does not load

I'm just wondering since you're using gradle now, are you going to add kapt annotation processing? Example shown here: https://spring.io/guides/tutorials/spring-boot-kotlin/#_configuration_properties

graphql-java 14 is out now, is it too late to support it for a 2.0 release?

Just curious, how have you managed to used this with legacy (such as spring MVC without webflux) servers? I'm assuming you could only do this by using graphql-java or by creating a new server which uses the legacy server as a service

Hey quick question: are subscriptions and custom directives supported?

hi, when using apollo federation, would using apollo graph manager be recommended for this? It's possible to use it for the gateway but would there be a way registering services shown here: https://www.apollographql.com/docs/graph-manager/federation/#registering-federated-services or is there a more recommended way for a non apollo js server? Because preventing breaking changes would be quite helpful.

Hi, there is a new CVE issue published on 18th of February on io.netty dependencies. I just integrated graphql-kotlin to our backend project and started to get security warnings. More information for CVE https://snyk.io/vuln/SNYK-JAVA-ORGWSO2TRANSPORTHTTP-548944 . Any suggestion is appreciated.

Hey, does `DataLoader`support kotlin coroutines? Using version 2.1.0 Java Example: https://github.com/ExpediaGroup/graphql-kotlin/blob/master/examples/spring/src/main/kotlin/com/expediagroup/graphql/examples/dataloaders/DataLoaderConfiguration.kt

com.expediagroup.graphql.exceptions.TypeNotSupportedException: Cannot convert java.time.LocalDateTime? since it is not a valid GraphQL type or outside the supported packages is there an easy fix for this?

You can add a Scalar, https://expediagroup.github.io/graphql-kotlin/docs/writing-schemas/scalars#__docusaurus

Hey all, I was wondering if anyone has any experience implementing query scoped, read only transactions. We have a graphql schema where entities are stored in separate tables in Postgres. On the mutation side, the entities are updated together in a database transaction. We want to ensure that reads are consistent in the same way across a given read query. Right now, we have a race condition where an update can cause a data consistency issue if one data fetcher has read, an update happens, and then a second data fetcher reads. Technically we could start a transaction in Instrumentation and pin a database connection to the query context and have all of the underlying services share this transaction. Seems a little less than ideal and introduces some concurrency concerns since data fetchers can be async. Does anyone have any other suggestions or experiences trying to make transaction guarantees across a query?

i filed a bug about this before i got access to kotlin slack, but is there a way to use

@GraphQLID

to create an argument for a list of ids, like

foo(ids: [ID!]!)

?

Hey folks, i'm trying to generate client classes from a schema.graphql file but the generated file is empty? I don't think my setup can get any simplier ... but any suggestions on what I'm doing wrong are appreciated 🙏 schema.graphql

type Query {
 hello: String
}

command:

gradle graphqlGenerateClient --schemaFileName="src/main/resources/schema.graphq" --packageName="com.example.graphql.generated"

Oh and im running 3.0.0-RC2

ack, nevermind … i can’t read. i needed to do this:

override fun willGenerateGraphQLType(type: KType): GraphQLType? {
    return when (type.classifier as? KClass<*>) {
      // note the ::class.java
      CurrencyCodeProtos.CurrencyCode::class.java -> currencyCodeEnum
      else -> super.willGenerateGraphQLType(type)
    }
  }

looking through some old threads here, i’m seeing that expediagroup doesn’t use dataloader — do y’all have another solution to the N+1 query problem? i’d be happy to drop dataloader if possible

i just converted a graphql-java service to kotlin, then rewrote it to use graphql-kotlin. i ran load tests before and after. the final version has a significant performance regression … average latency rose from 200-ish ms to over 1000ms. this is using 3.0.0-rc5. i’ll dig in more but if anyone has guidance on where to look i could use the help!

Hi everyone, has anyone encounter an issue with

spring-devtool

and

graphql-kotlin-spring-server

when hot-swapping code? The full detail is here https://github.com/ExpediaGroup/graphql-kotlin/issues/730. Essentially it would work fine the first time around, but after you make some changes or just add a simple

println

I get this error

DataFetchingException: Object is not an instance of declaring class

. Would love to know if anyone encounter this and know how to fix this 🙂

just hit a snag though: after i introduced a second operation, i started getting a compilation error because both generated files include

typealias ID = String

so i’m getting

error: redeclaration: ID

… any ideas?

Hi all, I'm new to graphql, and I was wondering what is the best way to implement queries/mutations with restricted access based on user rights? in a restful api we would make endpoints restricted, I'm not sure how to approach this with graphql. I'm using ktor as well and graphql-kotlin. Thank you!

Hello everyone! I'm trying to write some custom scalar for LocalDate but I'm currently stuck with an issue I'm having some real trouble solving. I'm sending in some data to my mutator, along with it a date string formatted like "1989-04-24", and I'm met with an exception telling me `Cannot construct instance of

java.time.LocalDate

(no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)`

object DateCoercing : Coercing<Date, String> {

  override fun parseValue(input: Any?): Date = try {
    LocalDate.parse(serialize(input))
  } catch (e: DateTimeParseException) {
    throw CoercingParseValueException("...", e)
  }

  override fun parseLiteral(input: Any?): Date? = try {
    (input as? StringValue)?.value?.let { LocalDate.parse(it) }
  } catch (e: DateTimeParseException) {
    throw CoercingParseLiteralException("...", e)
  }

  override fun serialize(dataFetcherResult: Any?): String = dataFetcherResult.toString()
}

I've tried most of the common solutions found by Googling to no avail...

Hello, how do you handle N+1 problem? I know about data loaders, but they have a significant problem - they can’t be chained https://github.com/graphql-java/graphql-java/issues/1078 For example, if I have some field, that relies on two data loaders, it may not work. @Dariusz Kuc I’ve heard you don’t use them, so how do you handle it? Can you provide some code? I think it might be a useful example

Ok true 👍 And I was wrong, ContextWebFilter is for incoming and ExchangeFilterFunction for the outgoing requests via WebClient. However, the Reactor/Security Context (also GRAPHQL_CONTEXT_KEY) is not present there. The requests outside of graphq-kotlin handling have a populated Context. The Problem is also there outside of the FilterFunction. Using:

val reactorContext =
    coroutineContext[ReactorContext]?.context

in a resolver function won't return the context

Hi! Please, it is possible to change name of ENUM while generating graphql schema? In my case, I need to have enum name like this

name

(lowercase). Kotlin does not support this naming, because

Conflicting declarations: enum entry name, public final val name: String

. So, I want to name it with UPPERCASE and then generate enum names to GraphQL schema as lowercase (example below). I tried to use

@GraphQLName

, but it doesn't work with ENUM classes 😞

enum class ApplicantsUpdateColumn {
    @GraphQLName("id")
    ID,

    @GraphQLName("data")
    DATA,

    @GraphQLName("name")
    NAME //I want to have this as lowercase "name"
}

Should it be possible to use

javax.validation.constraints.Positive

on a resolver argument? It currently crashes

@Validated
class QueryImpl:Query{
  override suspend fun query(id: String, @Positive amount: BigDecimal)
}

java.lang.ArrayIndexOutOfBoundsException: Index 3 out of bounds for length 3

at java.base/java.util.Arrays$ArrayList.get(Arrays.java:4351)

at org.hibernate.validator.internal.metadata.aggregated.ParameterMetaData$Builder.build(ParameterMetaData.java:169)

at org.hibernate.validator.internal.metadata.aggregated.ExecutableMetaData$Builder.findParameterMetaData(ExecutableMetaData.java:435)

at org.hibernate.validator.internal.metadata.aggregated.ExecutableMetaData$Builder.build(ExecutableMetaData.java:388)

at org.hibernate.validator.internal.metadata.aggregated.BeanMetaDataImpl$BuilderDelegate.build(BeanMetaDataImpl.java:788)

at org.hibernate.validator.internal.metadata.aggregated.BeanMetaDataImpl$BeanMetaDataBuilder.build(BeanMetaDataImpl.java:648)

at org.hibernate.validator.internal.metadata.BeanMetaDataManager.createBeanMetaData(BeanMetaDataManager.java:204)

at org.hibernate.validator.internal.metadata.BeanMetaDataManager.getBeanMetaData(BeanMetaDataManager.java:166)

at org.hibernate.validator.internal.engine.ValidatorImpl.validateParameters(ValidatorImpl.java:265)

at org.hibernate.validator.internal.engine.ValidatorImpl.validateParameters(ValidatorImpl.java:233)

at org.springframework.validation.beanvalidation.MethodValidationInterceptor.invoke(MethodValidationInterceptor.java:105)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)

at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)

at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)

at capital.scalable.agenttoolapi.routes.graphql.schema.payments.mutation.resolver.WealthPaymentCreationMutationResolver$$EnhancerBySpringCGLIB$$fa066940.deposit(<generated>)

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.base/java.lang.reflect.Method.invoke(Method.java:566)

at kotlin.reflect.jvm.internal.calls.CallerImpl$Method.callMethod(CallerImpl.kt:97)

at kotlin.reflect.jvm.internal.calls.CallerImpl$Method$Instance.call(CallerImpl.kt:113)

at kotlin.reflect.jvm.internal.KCallableImpl.call(KCallableImpl.kt:106)

at kotlin.reflect.full.KCallables.callSuspend(KCallables.kt:55)

at com.expediagroup.graphql.execution.FunctionDataFetcher$runSuspendingFunction$1.invokeSuspend(FunctionDataFetcher.kt:128)